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Climate Control Problems (Air Conditioning, Heat) - All Cars

791 messages,  Last post on Aug 12, 2009 at 12:55 PM

You are in the Maintenance & Repair Forum. Your Host is mr_shiftright

What is this discussion about? Heating / Cooling


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#746 of 791
Re: renault clio 1.5dci 2004 heater blowing hot then cold [kiawah] by den9112
May 01, 2009 (2:50 am)
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Replying to: kiawah (Apr 29, 2009 4:30 am)

Problem solved , it was the mixer motor. The electric driven motorised flap was sticking /damaged due possibly to previous owner not fitting a cabin filter which allowed a lot of dirt down the throat of the tube .New filter and new motor fitted and all is ok now. Thanks people for your help .
#747 of 791
94 Saturn A/C solenoid problem by saturnowner1
May 31, 2009 (6:08 pm)
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I cant get my a/c compressor to engage on my '94 LS Saturn. I have 45 psi on the low side of the compressor. When I press in the a/c switch on the dash, the switch lights up but the clutch does not engage on the compressor. It appears that there is no current getting to the solenoid, yet both a/c fuses are good and the control relay on the circuit breaker panel is good. any ideas?
#748 of 791
Re: 94 Saturn A/C solenoid problem [saturnowner1] by Mr_Shiftright HOST
May 31, 2009 (6:17 pm)
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Replying to: saturnowner1 (May 31, 2009 6:08 pm)

Must be an open circuit then between the pressure switch and the HVAC control module if there is no current to the compressor clutch.
 
Also your pressure is too high. Maybe the switch shuts off on too low AND too high pressure, I don't know.
 
About 28 to 30 PSI on the low side at 70 degrees F.
#749 of 791
Re: 94 Saturn A/C solenoid problem [Mr_Shiftright] by saturnowner1
May 31, 2009 (6:23 pm)
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Replying to: Mr_Shiftright (May 31, 2009 6:17 pm)

thanks,
My pressure is in the blue on the low side meter (i'm guessing that was 45). Any idea what my next step is? can I go straight from the solenoid to the a 12v source and see if it turns on? or is this something that needs to go to an a/c expert?
#750 of 791
Re: 94 Saturn A/C solenoid problem [saturnowner1] by Mr_Shiftright HOST
May 31, 2009 (6:43 pm)
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Replying to: saturnowner1 (May 31, 2009 6:23 pm)

Can you locate the pressure switch and momentarily by-pass it? That might tell you something right there.
#751 of 791
Re: 94 Saturn A/C solenoid problem [Mr_Shiftright] by saturnowner1
May 31, 2009 (8:04 pm)
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Replying to: Mr_Shiftright (May 31, 2009 6:43 pm)

not sure where the pressure switch is.
#752 of 791
Re: 94 Saturn A/C solenoid problem [saturnowner1] by Mr_Shiftright HOST
Jun 01, 2009 (6:00 am)
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Replying to: saturnowner1 (May 31, 2009 8:04 pm)

Looks like it's on a T-fitting running along the AC hose---the diagram seems to indicate near the fender as it meets the firewall---I think if you follow the AC line up you'll see a T fitting with a switch that looks like a brake light switch, with an electrical connector.
#753 of 791
Re: 94 Saturn A/C solenoid problem [Mr_Shiftright] by saturnowner1
Jun 01, 2009 (6:11 am)
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Replying to: Mr_Shiftright (Jun 01, 2009 6:00 am)

Brrrrr..Up and running: spent $50 this morning at an a/c shop: I was close with my refill job..but as I was filling it I should have rev'd the engine to about 2000 rpm. Once the mechanic did this and added a little more pressure on the fill, the low pressure switch activated, powered the solenoid, and the system ran. As usual, a simple fix by a professional. Thanks again Mr Shiftright for all your help.
#754 of 791
Re: 94 Saturn A/C solenoid problem [saturnowner1] by Mr_Shiftright HOST
Jun 01, 2009 (6:14 am)
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Replying to: saturnowner1 (Jun 01, 2009 6:11 am)

Well okay we were on the right track---another 3 or 4 weeks and we would have solved it!!
 
Now think of all you've learned.
 
Anyway, if you had bypassed the low pressure switch, the compressor would have clicked on, telling you that there was low pressure in the system. Where did you get that 45 psi reading from? Oh, you said that was a guesstimate....

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